<template>
<view>
	<view class="signature">
		<canvas class="mycanvas" canvas-id="mycanvas" @touchstart="touchstart" @touchmove="touchmove" @touchend="touchend"></canvas>
		<view class="footer">
			<view class="left" @click="finish">保存</view>
			<view class="right" @click="clear">清除</view>
			<view class="close" @click="back">返回</view>
		</view>
	</view>
</view>
</template>
<script>
var x = 20;
var y =20;
import request from '@/util/request.js'
export default {
	data() {
		return {
			//oaRole 1:店长2:员工3:商户
			imgUrl:this.url,
			mark_id:0,
			ctx:'',         //绘图图像
			points:[],       //路径点集合 
			signature:''
		}
	},
	onLoad:function(e){
		this.mark_id = e.id
		this.createCanvas()
	},
	methods: {
		//返回
		back:function(){
			uni.navigateBack()
		},
		//创建并显示画布
		createCanvas:function(){
			this.ctx = uni.createCanvasContext("mycanvas",this);   //创建绘图对象
			//设置画笔样式
			this.ctx.lineWidth = 4;
			this.ctx.lineCap = "round"
			this.ctx.lineJoin = "round"
		},
		//触摸开始，获取到起点
		touchstart:function(e){
			let startX = e.changedTouches[0].x;
			let startY = e.changedTouches[0].y;
			let startPoint = {X:startX,Y:startY};
			this.points.push(startPoint);
			//每次触摸开始，开启新的路径
			this.ctx.beginPath();
		},
		//触摸移动，获取到路径点
		touchmove:function(e){
			let moveX = e.changedTouches[0].x;
			let moveY = e.changedTouches[0].y;
			let movePoint = {X:moveX,Y:moveY};
			this.points.push(movePoint);       //存点
			let len = this.points.length;
			if(len>=2){
				this.draw();                   //绘制路径
			}
		},
		// 触摸结束，将未绘制的点清空防止对后续路径产生干扰
		touchend:function(){                   
			this.points=[];
		},
		/* ***********************************************
		#   绘制笔迹
		#	1.为保证笔迹实时显示，必须在移动的同时绘制笔迹
		#	2.为保证笔迹连续，每次从路径集合中区两个点作为起点（moveTo）和终点(lineTo)
		#	3.将上一次的终点作为下一次绘制的起点（即清除第一个点）
		************************************************ */
		draw: function() {
			let point1 = this.points[0]
			let point2 = this.points[1]
			this.points.shift()
			this.ctx.moveTo(point1.X, point1.Y)
			this.ctx.lineTo(point2.X, point2.Y)
			this.ctx.stroke()
			this.ctx.draw(true)
		},
		
		//清空画布
		clear:function(){
			let that = this;
			uni.getSystemInfo({
				success: function(res) {
					let canvasw = res.windowWidth;
					let canvash = res.windowHeight;
					that.ctx.clearRect(0, 0, canvasw, canvash);
					that.ctx.draw(true);
				},
			})
		},
		//完成绘画并保存到本地
		finish:function(){
			let that = this;
			var token = 'tymy'
			uni.canvasToTempFilePath({
				canvasId: 'mycanvas',
				success: function(res) {
					//上传到服务器
					uni.uploadFile({
						// 需要上传的地址
						url:that.imgUrl+'/api/manage/mark/sign',
						// filePath  需要上传的文件
						filePath: res.tempFilePath,
						name:'img',
						header: {
							'Authorization' : 'Bearer' + token
						},
						formData:{mark_id:that.mark_id},
						success(res1) {
							if(res1.data == '签名成功'){
								that.clear();
								uni.showToast({
									title:'签名成功',
									icon: 'none',
									duration: 2000,
									success() {
										setTimeout(function() {
											uni.navigateBack()
										}, 2000);
									}
								})
							}else{
								uni.showToast({
									title: '签名失败!!',
									icon: "none", 
									position:'bottom',
								});
								return;
							}
						}
					});
				//保存到本地
				/* 
				
				let path = res.tempFilePath;
				uni.saveImageToPhotosAlbum({
					filePath:path,
				}) */
			  } 
			})
		},
	}
}
</script>
<style>
@import url("../css/mark/sign.css");
</style>